I love this stuff. It's expensive but great quality. It makes my hair super soft, clean and it smells great. I have tried so many shampoos and conditioners lately and this is the cleanest, softest my hair has felt in a while. In terms of straightness, I already have straight hair but there are less flyaways and less frizz. Not a significant amount though. But I don't think there is any shampoo that can really fix that. That is something that is done through blow drying and styling products. I use this with the conditioner, which I also love. This is expensive but you don't need to use very much, even for long thick hair. Love it!